GROWTH VARIABLES AND WEIBULL DIAMETER DISTRIBUTION MODELS FOR MANGROVE SPECIES IN FORESTRY RESEARCH INSTITUTE OF NIGERIA,ONNE, RIVERS STATE,

Authors

  • Okedimma, F.C
  • Oyebade, B.A
  • Eguakun, F.S
  • Ezenwaka, J

Keywords:

growth variables, weibull distribution function, sustainable management, mangrove

Abstract

  1. Identification and estimation of quantitative variables of tree stands are basic requirements for forest
    planning, management and production. This study was conducted to assess the growth variables and
    diameter distribution models of mangrove species in swamp forest of Onne and to ascertain the best
    fitting models using Weibull diameter distribution. Systematic sampling technique was employed for
    plot location. The design used four – 10m x 20m rectangular plots laid along four 100m transects at
    intervals of 10m; with 5 x 5m sub-plots nested within them and in an alternate manner. All mangrove
    trees with diameter > 10cm were measured in the entire plots while on the 5 x 5m sub-plots, all trees
    with diameter < 10cm and height > 1.3m were measured. The mangrove species composition in the
    study zone revealed 231 mangrove tree stands belonging to two families namely: Rhizophoraceace and
    Avicenniaceace. Species richness of the mangrove species in the study area shows that Rhizophora
    racemosa were the most abundant with 212 stands and 0.073m3 of volume, followed by Avicennia
    germinans and Rhizophora mangle. The Rhizophoraceace was the most prevalent family, while low
    diversity of some families may be attributed to natural competition. There were strong correlations among the species growth parameters with significant correlation coefficients at P<0.05. The goodness
    of fit for the mangrove species revealed that Kolmogorov Smirnov (Ks) had the better ranking followed by Anderson Darling (HA) and Chi-Squared (R
    2
    ). This is indicative of plausible potential of Weibull
    diameter probability distribution function (PDF) in fitting diameter classes for sustainable management
    of mangrove ecosystem.

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Published

2024-03-07

How to Cite

Okedimma, F.C, Oyebade, B.A, Eguakun, F.S, & Ezenwaka, J. (2024). GROWTH VARIABLES AND WEIBULL DIAMETER DISTRIBUTION MODELS FOR MANGROVE SPECIES IN FORESTRY RESEARCH INSTITUTE OF NIGERIA,ONNE, RIVERS STATE, . BW Academic Journal, 16. Retrieved from https://bwjournal.org/index.php/bsjournal/article/view/1796

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